Please don’t try the oxygen tank idea. It’s counterintuitive but 100% O2 isn’t good for you (unless you need it to get enough saturation, and the alternative is hypoxemia).
You asked for weird tips, so here’s mine. Caffeine pills instead of coffee. Gives you more room for water which is good for you, good for weight loss, and fills you up a bit. Plus replaces coffee which typically includes sugar (or replaces energy drinks which can have way more sugar). Double plus, you’ll get more consistent doses of caffeine which is even an appetite suppressant. All that, and you’ll still have the energy for whatever workout you want to do. Just make sure you keep some calories in and lots of water. And be careful, start slow like 100-200mg unless you know what you’re doing.
You asked for weird tips, so here’s mine. Caffeine pills instead of coffee. Gives you more room for water which is good for you, good for weight loss, and fills you up a bit. Plus replaces coffee which typically includes sugar (or replaces energy drinks which can have way more sugar). Double plus, you’ll get more consistent doses of caffeine which is even an appetite suppressant. All that, and you’ll still have the energy for whatever workout you want to do. Just make sure you keep some calories in and lots of water. And be careful, start slow like 100-200mg unless you know what you’re doing.
Good luck!